1 files changed, 53 insertions, 0 deletions
diff --git a/modules/extra/enc_posix.cpp b/modules/extra/enc_posix.cpp
new file mode 100644
index 000000000..c2f60be5e
--- /dev/null
+++ b/modules/extra/enc_posix.cpp
@@ -0,0 +1,53 @@
+/* Module for providing POSIX crypt() hashing
+ *
+ * (C) 2003-2024 Anope Team
+ * Contact us at team@anope.org
+ *
+ * This program is free but copyrighted software; see the file COPYING for
+ * details.
+ *
+ */
+
+/* RequiredLibraries: crypt */
+
+#include "module.h"
+
+class EPOSIX final
+	: public Module
+{
+public:
+	EPOSIX(const Anope::string &modname, const Anope::string &creator)
+		: Module(modname, creator, ENCRYPTION | VENDOR)
+	{
+		if (ModuleManager::FindFirstOf(ENCRYPTION) == this)
+			throw ModuleException("enc_posix can not be used as a primary encryption method");
+	}
+
+	void OnCheckAuthentication(User *, IdentifyRequest *req) override
+	{
+		const auto *na = NickAlias::Find(req->GetAccount());
+		if (!na)
+			return;
+
+		NickCore *nc = na->nc;
+		auto pos = nc->pass.find(':');
+		if (pos == Anope::string::npos)
+			return;
+
+		Anope::string hash_method(nc->pass.begin(), nc->pass.begin() + pos);
+		if (!hash_method.equals_cs("posix"))
+			return;
+
+		Anope::string pass_hash(nc->pass.begin() + pos + 1, nc->pass.end());
+		if (pass_hash.equals_cs(crypt(req->GetPassword().c_str(), pass_hash.c_str())))
+		{
+			// If we are NOT the first encryption module we want to re-encrypt
+			// the password with the primary encryption method.
+			if (ModuleManager::FindFirstOf(ENCRYPTION) != this)
+				Anope::Encrypt(req->GetPassword(), nc->pass);
+			req->Success(this);
+		}
+	}
+};
+
+MODULE_INIT(EPOSIX)